Patents by Inventor Albert G. Bieber

Albert G. Bieber has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Refining highly aromatic lube oil stocks
    Patent number: 4333824
    Abstract: A process for solvent extraction of higher aromatic hydrocarbon oils with N-methyl-2-pyrrolidone wherein N-methyl-2-pyrrolidone is separated from a solvent-extract mix in a series of distillation steps with recirculation of a portion of a partially stripped extract mix from an intermediate distillation step to the extraction step to improve the solvent-oil ratio in the extraction step and conserve energy as compared with conventional processes in which the solvent power of N-methyl-2-pyrrolidone is moderated by incorporating water in the solvent.
    Type: Grant
    Filed: June 27, 1980
    Date of Patent: June 8, 1982
    Assignee: Texaco Inc.
    Inventors: William F. Brown, Albert G. Bieber